Search found 119 matches

by Violet Kwan 3H
Sun Feb 28, 2021 10:52 pm
Forum: *Organic Reaction Mechanisms in General
Topic: K meaning
Replies: 21
Views: 205

Re: K meaning

K stands for the Boltzmann constant which is 1.380649×10^−23 J/K. You can find it on the equations worksheet :)
by Violet Kwan 3H
Sun Feb 28, 2021 10:50 pm
Forum: Student Social/Study Group
Topic: We made it through Midterm 2!
Replies: 64
Views: 192

Re: We made it through Midterm 2!

YESS great job everyone! Keep it up! Just a few weeks left until break :))
by Violet Kwan 3H
Sun Feb 28, 2021 10:49 pm
Forum: Student Social/Study Group
Topic: Final
Replies: 43
Views: 101

Re: Final

I think going over the textbook problems will probably be the best way to review and cover all the topics. The UA workshops also tend to be good review sessions before finals :)
by Violet Kwan 3H
Sun Feb 28, 2021 10:47 pm
Forum: Student Social/Study Group
Topic: Playlist
Replies: 29
Views: 68

Re: Playlist

I've been listening to "Dandelions" by Ruth B lately! such a cute song
by Violet Kwan 3H
Sun Feb 28, 2021 10:42 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: n in ∆G = -nFE
Replies: 49
Views: 99

Re: n in ∆G = -nFE

n stands for the number of electrons (in moles) that are being transferred. You find this by balancing the half reactions.
by Violet Kwan 3H
Sun Feb 28, 2021 10:38 pm
Forum: Student Social/Study Group
Topic: Fave food
Replies: 127
Views: 268

Re: Fave food

OMG banana bread is the best. I love noodles, and my favorites are pho or spicy ramen!
by Violet Kwan 3H
Mon Feb 22, 2021 3:06 am
Forum: Student Social/Study Group
Topic: Classes for next quarter?
Replies: 133
Views: 438

Re: Classes for next quarter?

I'm planning to take Chem BL, LS 7C, LS 30B, and GE :)
by Violet Kwan 3H
Mon Feb 22, 2021 3:04 am
Forum: Student Social/Study Group
Topic: Preparing
Replies: 24
Views: 85

Re: Preparing

Organic Chemistry Tutor videos are always helpful. They provide explanations and practice problems!
by Violet Kwan 3H
Mon Feb 22, 2021 3:01 am
Forum: Van't Hoff Equation
Topic: Celcius vs Kelvin for T1 and T2
Replies: 61
Views: 301

Re: Celcius vs Kelvin for T1 and T2

It is best to use Kelvin just to be safe
by Violet Kwan 3H
Mon Feb 22, 2021 2:57 am
Forum: Balancing Redox Reactions
Topic: Oxygen
Replies: 12
Views: 95

Re: Oxygen

Oxygen has an oxidation/reduction number of 0 when it is in the O2 form, but it is -2 in a compound form.
by Violet Kwan 3H
Mon Feb 22, 2021 2:55 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: fun way to remember anode and cathode
Replies: 16
Views: 58

Re: fun way to remember anode and cathode

Thanks for sharing! I will definitely remember now :)
by Violet Kwan 3H
Mon Feb 22, 2021 2:55 am
Forum: Student Social/Study Group
Topic: Chem 14B Final
Replies: 83
Views: 207

Re: Chem 14B Final

I would also recommend going to UA sessions because they have taken the class and know which problems are good to practice. I also review the textbook problems and watch some youtube review videos.
by Violet Kwan 3H
Mon Feb 22, 2021 2:53 am
Forum: Student Social/Study Group
Topic: Balance / Self Care Tips
Replies: 43
Views: 128

Re: Balance / Self Care Tips

It is definitely hard to remember that I should take breaks when I am studying for midterms. But for self-care I usually take a walk outside or call my friends for a break from work.
by Violet Kwan 3H
Sun Feb 14, 2021 9:19 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: qrev vs q
Replies: 19
Views: 56

Re: qrev vs q

qrev is specific for a reversible reaction
by Violet Kwan 3H
Sun Feb 14, 2021 9:15 pm
Forum: Student Social/Study Group
Topic: Silly Mistakes?
Replies: 60
Views: 291

Re: Silly Mistakes?

Love this reminder, especially with midterms coming up. Thanks!
by Violet Kwan 3H
Sun Feb 14, 2021 9:12 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: temperature
Replies: 32
Views: 87

Re: temperature

It can depend, so definitely check the problem to make sure your final answer is in the units that they are asking for. The conversion isn't too hard either, so sometimes it's better to be safe and use Kelvin since it's the SI unit.
by Violet Kwan 3H
Sun Feb 14, 2021 9:07 pm
Forum: Student Social/Study Group
Topic: Finals
Replies: 23
Views: 64

Re: Finals

When I took the final last quarter, it definitely felt harder than the midterms. But, that makes sense since it's a culmination of everything. You got this though! Going to the UA sessions to review was a big help.
by Violet Kwan 3H
Sun Feb 14, 2021 9:05 pm
Forum: Student Social/Study Group
Topic: Fav Shows of the Moment
Replies: 104
Views: 244

Re: Fav Shows of the Moment

I'm watching Hospital playlist right now and it's so good! Also rewatching Psych :)
by Violet Kwan 3H
Tue Feb 09, 2021 6:06 pm
Forum: Student Social/Study Group
Topic: Recommendations for explanations/practice
Replies: 3
Views: 16

Recommendations for explanations/practice

Do you guys have any youtube channels/website recommendations that are useful for extra explanation/practice for the thermodynamic topics? It's been kind of difficult understanding everything. Thanks :)
by Violet Kwan 3H
Sun Feb 07, 2021 10:00 pm
Forum: Administrative Questions and Class Announcements
Topic: CC points, where to find?
Replies: 12
Views: 64

Re: CC points, where to find?

^^ If your TA has updated, you can find it in ccle or on your my.ucla page under "exam and homework grades" :)
by Violet Kwan 3H
Sun Feb 07, 2021 9:22 pm
Forum: Administrative Questions and Class Announcements
Topic: tips if you're struggling!
Replies: 72
Views: 364

Re: tips if you're struggling!

Thank you so much for typing this all out!! I also like the textbook problem tip, I saved the last few problems from each section to review right before the exam, and were fresh in my mind when they showed up on the test.
by Violet Kwan 3H
Fri Feb 05, 2021 5:55 pm
Forum: Student Social/Study Group
Topic: Study routine.
Replies: 51
Views: 105

Re: Study routine.

I try to go to at least a few workshops each week even if I am not completely familiar with the material because they explain it really well and it provides great problems to practice before the exams. I always do the outline problems (I believe he said two of the longer questions from the midterm w...
by Violet Kwan 3H
Fri Feb 05, 2021 5:41 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Reversible Reactions
Replies: 4
Views: 16

Re: Reversible Reactions

I was a little confused about this as well. There seem to be so many factors. Does anyone have an easy way to remember how to differentiate between reversible and irreversible processes?
by Violet Kwan 3H
Fri Feb 05, 2021 5:37 pm
Forum: General Science Questions
Topic: Careless Mistakes
Replies: 54
Views: 243

Re: Careless Mistakes

I totally relate to this as well! I catch myself making simple calculation mistakes often. One thing I do is write out all the steps on paper so that I can match it with what I am typing in the calculator, and it will be easier to check for mistakes. Another thing that may help is breaking up the eq...
by Violet Kwan 3H
Fri Feb 05, 2021 5:33 pm
Forum: Calculating Work of Expansion
Topic: Spontaneous
Replies: 25
Views: 90

Re: Spontaneous

A reaction is spontaneous if it is favorable for the formation of products and will occur without the addition of external energy. However, it does not say anything about the speed since spontaneous reactions can be fast or slow.
by Violet Kwan 3H
Sat Jan 30, 2021 7:21 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Taking the Anti-Log
Replies: 36
Views: 115

Re: Taking the Anti-Log

you would find Ka by doing:
10^(-pKa)
This will be very important because sometimes the questions give you information about the reaction where you have to convert in order to solve for the answer.
by Violet Kwan 3H
Sat Jan 30, 2021 7:05 pm
Forum: Ideal Gases
Topic: Exo vs Endothermic
Replies: 30
Views: 109

Re: Exo vs Endothermic

Sometimes in the book, you need to look at the chart for bond enthalpies and then solve to see if it is endothermic or exothermic. All the bonds broken would require energy, and the bonds formed will release energy.
by Violet Kwan 3H
Sat Jan 30, 2021 7:00 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Kelvin or Celsius?
Replies: 86
Views: 1436

Re: Kelvin or Celsius?

Kelvin is the SI unit for temperature, so I believe you would use that. Also, the conversion is just adding 273.15 to Celsius, so better just to be safe and convert to Kelvin.
by Violet Kwan 3H
Sat Jan 30, 2021 6:52 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Inert gas
Replies: 24
Views: 95

Re: Inert gas

Adding an inert gas will not change equilibrium because it is non-reactive. So, inert gases do not change the partial pressures of the other gases.
by Violet Kwan 3H
Sat Jan 30, 2021 6:49 pm
Forum: General Science Questions
Topic: MT 1 Grades
Replies: 8
Views: 79

Re: MT 1 Grades

In 14a it was about a week, it shouldn't take too long since it is multiple choice
by Violet Kwan 3H
Thu Jan 28, 2021 1:40 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: pKa and pH
Replies: 6
Views: 44

pKa and pH

What is the relationship between pka and pH? How are we able to compare them if they are measurements of different things (pKa is the -log of products/reactants while pH is only the -log of H3O+)? I understand how to apply them in questions or problems, but I have trouble understanding it conceptual...
by Violet Kwan 3H
Sat Jan 23, 2021 3:10 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: H3O+ and OH- concentration
Replies: 3
Views: 41

H3O+ and OH- concentration

If a question doesn't mention the presence of acids or bases, is it correct to assume that [OH-] = [H3O+] in water even if the Kw is different (due to temperature changes)?
by Violet Kwan 3H
Sat Jan 23, 2021 2:06 pm
Forum: Student Social/Study Group
Topic: Anxiety
Replies: 53
Views: 317

Re: Anxiety

It helps to plan out how much you will work/study each day so you won't get overwhelmed trying to cram. Also, it's always good to take breaks and do relaxing things like watch shows, call friends, or etc. for self-care. :)
by Violet Kwan 3H
Sat Jan 23, 2021 2:03 pm
Forum: Student Social/Study Group
Topic: Favorite Music
Replies: 104
Views: 296

Re: Favorite Music

Recently, when I study, I've been playing soft jazz songs. But in general, I really like contemporary R&, K R&B, or chill pop.
by Violet Kwan 3H
Sat Jan 23, 2021 1:58 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE Tables
Replies: 35
Views: 90

Re: ICE Tables

The "I" row refers to the concentration or molarity, and the "C" row only refers to the coefficients.
by Violet Kwan 3H
Sat Jan 23, 2021 1:50 pm
Forum: Student Social/Study Group
Topic: Comfort Movies
Replies: 128
Views: 353

Re: Comfort Movies

I never get tired of watching original Disney movies like Lemonade Mouth or Camp Rock (even if they can be a bit cringy looking back :) )
by Violet Kwan 3H
Sat Jan 23, 2021 1:46 pm
Forum: Administrative Questions and Class Announcements
Topic: Grading for Chemistry Community Posts
Replies: 12
Views: 60

Re: Grading for Chemistry Community Posts

My TA checks for 5 posts per week, but you can always contact your TA and ask them since some do allow 50 posts by week 10.
by Violet Kwan 3H
Sat Jan 23, 2021 1:42 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Homework 5J.5b
Replies: 4
Views: 52

Re: Homework 5J.5b

One other thing to remember is that we do not consider the solids or liquids when looking at the moles to compare (I made this mistake when I tried answering the problem). So, you would look at the moles of gaseous reactants (just H20), which is less than the gaseous products combined (H2 and CO).
by Violet Kwan 3H
Sun Jan 17, 2021 2:50 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Using the ICE table
Replies: 36
Views: 139

Re: Using the ICE table

Yes, you can use it for both! There will be practice problems that you come across where you will have to use the ICE table to solve questions relating to pressure.
by Violet Kwan 3H
Sun Jan 17, 2021 2:49 pm
Forum: Ideal Gases
Topic: Bars to atm [ENDORSED]
Replies: 41
Views: 241

Re: Bars to atm [ENDORSED]

The values are a bit different, but for this class, Dr. Lavelle said they are close enough to just approximate it as 1atm=1barr.
by Violet Kwan 3H
Sun Jan 17, 2021 2:47 pm
Forum: Student Social/Study Group
Topic: Approaching Outlines
Replies: 14
Views: 71

Re: Approaching Outlines

I like to read the textbook at the end of the week and then do the outline problems to check what I know and practice. Sometimes I do fall behind the outline schedule I plan for myself, but I make sure that I at least complete all of them before the midterm.
by Violet Kwan 3H
Sun Jan 17, 2021 2:43 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Approximations
Replies: 4
Views: 29

Approximations

Hello, can someone explain why we can approximate the value of x when the Ka is smaller than 10^-4? For example, (x^2)/(0.20-x) could just be approximated to (x^2)/(0.20) if the Ka was 1.8*10^-5.

I understand when to apply it, but I don't really understand conceptually what is happening. Thanks :)
by Violet Kwan 3H
Sun Jan 17, 2021 2:37 pm
Forum: Student Social/Study Group
Topic: Motivation
Replies: 34
Views: 179

Re: Motivation

Sometimes when I feel unmotivated, I call my friends or classmates to study. Since we are all working hard, study calls help to motivate me and enjoy doing the work as we struggle or encourage each other. Also, I make a to-do list every day so I can keep track of everything I need to do, and it is s...
by Violet Kwan 3H
Sun Jan 17, 2021 2:32 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling HW1 Question 9
Replies: 6
Views: 48

Re: Sapling HW1 Question 9

You are on the right track! Putting 0.8 for the initial concentration of [NO] is right because the ICE table is used to refer to the concentration right before a new shift. When you add more products, the chemical reaction will want to adjust to minimize the change according to Le Chatlier's Princip...
by Violet Kwan 3H
Sun Jan 10, 2021 11:57 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE Tables
Replies: 11
Views: 81

Re: ICE Tables

You use it when you want to find the equilibrium concentrations/compositions of the reactants and products at equilibrium. Usually, it will give you the initial concentration and K constant.
by Violet Kwan 3H
Fri Jan 08, 2021 6:31 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Clarification of terminology
Replies: 15
Views: 129

Re: Clarification of terminology

Yes, that is exactly right! And vice versa if Q > K.
by Violet Kwan 3H
Fri Jan 08, 2021 6:24 pm
Forum: Ideal Gases
Topic: PV=nRT and concentration
Replies: 27
Views: 132

Re: PV=nRT and concentration

Molarity is a way to describe the concentration specifically in terms of moles per liter. So, the "n" represents moles and "V" represents the volumes in liters. Because these variables are present in the equation, we can rearrange it in order to solve for the concentration.
by Violet Kwan 3H
Fri Jan 08, 2021 6:21 pm
Forum: Administrative Questions and Class Announcements
Topic: Proctored Exam?
Replies: 13
Views: 110

Re: Proctored Exam?

For 14a, we had to use Respondus so that you can't open other pages on your computer. We all also had to join a zoom on a second device with our TA showing our workspace and allowing them to help with any issues that arise. Last quarter, it was all multiple choice for the midterms and finals.
by Violet Kwan 3H
Fri Jan 08, 2021 6:16 pm
Forum: Administrative Questions and Class Announcements
Topic: Audio-Visual Topics
Replies: 13
Views: 84

Re: Audio-Visual Topics

I don't think that there will be audio-visual topic videos for later sections. They are not graded, but they are super helpful! Textbook problems and UA workshop practice will provide the best practice for later sections.
by Violet Kwan 3H
Mon Jan 04, 2021 3:54 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K vs. Kc
Replies: 15
Views: 100

Re: K vs. Kc

I also agree with the posts above. Since the difference between the two is small, they can basically be considered the same or used interchangeably. Just depends on which specific concentration you need or what the question calls for.
by Violet Kwan 3H
Tue Dec 15, 2020 6:58 pm
Forum: Student Social/Study Group
Topic: How are you?
Replies: 117
Views: 878

Re: How are you?

I'm feeling pretty good! Just finished my last exam final, so now I only have one essay final left (which isn't too difficult). So excited for winter break!! We are almost done with the quarter! :,)
by Violet Kwan 3H
Thu Dec 10, 2020 12:06 pm
Forum: Conjugate Acids & Bases
Topic: Conjugate of Strong Acids/Bases
Replies: 1
Views: 17

Conjugate of Strong Acids/Bases

Why is it that the conjugates of strong acids or bases in salts won't affect the pH of the solution? I understand how to solve the problems, but it's hard for me to understand conceptually.
by Violet Kwan 3H
Thu Dec 10, 2020 11:56 am
Forum: Naming
Topic: Naming quizlet
Replies: 41
Views: 302

Re: Naming quizlet

Thank you for dropping this! I definitely need to review these.
by Violet Kwan 3H
Thu Dec 10, 2020 11:52 am
Forum: Student Social/Study Group
Topic: PUSH THROUGH!!
Replies: 29
Views: 200

Re: PUSH THROUGH!!

Awh, thank you for the reminder! So true though, we all worked so hard this whole quarter. We just have to finish strong :) GOOD LUCK EVERYONE!
by Violet Kwan 3H
Thu Dec 10, 2020 11:41 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining Shape
Replies: 10
Views: 143

Re: Determining Shape

Electron geometry takes into account the number of electron densities, so it includes the bonded atoms AND lone pairs. The molecular shape only looks at the bonded atoms and the shape it makes with the presence of the repulsion of the lone pairs. If there are no lone pairs, then the molecular geomet...
by Violet Kwan 3H
Tue Dec 08, 2020 6:52 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: relative acidity properties
Replies: 2
Views: 33

Re: relative acidity properties

Both HF and CH2FCOOH are weak acids; the only strong acids are HCl, HBr, HI, H2SO4, HClO3, and HClO4. CH2FCOOH is indeed stronger than HF; you don't need to know why, but you would be able to tell by looking at their respective Ka or pKa. When comparing the relative strength of two acids, there wil...
by Violet Kwan 3H
Tue Dec 08, 2020 12:50 am
Forum: Lewis Acids & Bases
Topic: Water
Replies: 62
Views: 549

Re: Water

It is an amphoteric compound, which means that it can react both as an acid and as a base. So yes, it depends on the problem.
by Violet Kwan 3H
Tue Dec 08, 2020 12:32 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: relative acidity properties
Replies: 2
Views: 33

relative acidity properties

Why would the molecule HF be a weak acid while CH2FCOOH be a strong acid? Both of them have fluorine which is a more electronegative and smaller atom, so why it would create different acid strengths? I know it has to do with two different characteristics, but I was wondering if someone could explain...
by Violet Kwan 3H
Sun Dec 06, 2020 6:02 pm
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 250
Views: 36284

Re: Final Jitters

I try to prep everything the night before (printing out the material or organizing my workspace) so I can feel more prepared. I sometimes call my friends before our exams either to take our minds off of it or to encourage each other! Also, being stressed can also be a sign that your body is preparin...
by Violet Kwan 3H
Sun Dec 06, 2020 5:58 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Does pH indicate strength of an acid?
Replies: 26
Views: 169

Re: Does pH indicate strength of an acid?

Yes, I agree with all of the other comments. The pH is measured by the concentration of H30+ molecules. In turn, the amount of hydronium molecules formed is dependent on the strength of the acid.
by Violet Kwan 3H
Sun Dec 06, 2020 5:53 pm
Forum: Student Social/Study Group
Topic: Upcoming Finals
Replies: 7
Views: 92

Re: Upcoming Finals

Awh I love this! So true, I can't believe that the quarter is almost over. I definitely agree that I need to balance all of my studying and try not to cram before the final. We got this! :)
by Violet Kwan 3H
Sun Dec 06, 2020 3:54 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Sapling Homework 9 Problem 2
Replies: 10
Views: 118

Re: Sapling Homework 9 Problem 2

I would also agree with the comments above. It would be helpful to just recognize the common ligands and memorize how many binding sites they have. Drawing it out can also help if you are stuck! I think you have the basic ideas down, just know that for bidentates you add 2 (2 binding sites), trident...
by Violet Kwan 3H
Sun Dec 06, 2020 3:45 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: coordination number
Replies: 13
Views: 80

Re: coordination number

The coordination number is the number of bonds made with the transition metal. Some ligands may have more than one bonding sites with the transition metal, such as bidentate and tridentate ligands. A bidentate would count as 2 and a tridentate would count as 3. To get the coordination number, you wo...
by Violet Kwan 3H
Sun Dec 06, 2020 3:39 am
Forum: Naming
Topic: what does (en) mean?
Replies: 23
Views: 183

Re: what does (en) mean?

(en) stands for ethylenediamine. It is one of the neutral ligands that we will have to know for the class. Someone earlier posted a link to the worksheet showing all the ligands we should be familiar with, so you should look over that as well :)
by Violet Kwan 3H
Sun Nov 29, 2020 4:49 am
Forum: Student Social/Study Group
Topic: Final Study
Replies: 32
Views: 220

Re: Final Study

I will try to start as early as possible because I don't want to cram all the material before the final.
I will be watching youtube review videos as well as redoing the textbook questions and UA worksheets. Good luck studying and on the final :)
by Violet Kwan 3H
Sun Nov 29, 2020 4:46 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 11
Views: 70

Re: Bond Angles

I agree with the post above. I do not think that we need to know the exact angle that is caused by a lone pair. You compare the slightly smaller or larger angles to angle degrees of the first few molecular shapes Dr. Lavelle showed us without lone pairs.
by Violet Kwan 3H
Sat Nov 28, 2020 9:32 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining shape with lone pairs
Replies: 5
Views: 32

Determining shape with lone pairs

When a molecule has a lone pair, we only look at the atoms to determine its molecular geometry. But the electron densities still include the lone pairs for the electronic geometry. When we try to figure out which atom from the electronic geometry to be considered a lone pair, do you guys have a way ...
by Violet Kwan 3H
Sat Nov 28, 2020 9:23 am
Forum: Trends in The Periodic Table
Topic: Ionic radius trends
Replies: 7
Views: 119

Re: Ionic radius trends

When there is a higher positive charge, that means that there is a higher number of protons than there are electrons. The electrons and protons attract each other, so if there are more protons, it will pull more of the electrons in. Also, with a lost electron, there would be less repulsion between t...
by Violet Kwan 3H
Sat Nov 28, 2020 9:12 am
Forum: Determining Molecular Shape (VSEPR)
Topic: How do you know if atoms lie in the same plane?
Replies: 5
Views: 42

Re: How do you know if atoms lie in the same plane?

I agree that memorizing the VSEPR chart will help you to see there the planes are. Also, for shapes like tetrahedral, not all the atoms are in the same plane. But, each “bottom” atom is in the same plane with the “top” atom separately; it’s relative and depends which atoms you are looking at. Thats ...
by Violet Kwan 3H
Mon Nov 23, 2020 12:13 am
Forum: Student Social/Study Group
Topic: Big Sad: Midterm 2
Replies: 86
Views: 943

Re: Big Sad: Midterm 2

I felt that this midterm was a bit harder because it was more conceptual and there was one question that I just didn't understand, so that was a bit discouraging. But in all, I'm sure we all did our best and hopefully everything will work out when scores are released :)
by Violet Kwan 3H
Mon Nov 23, 2020 12:10 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Lectures through Thanksgiving
Replies: 7
Views: 91

Re: Lectures through Thanksgiving

I also think that there might be a lecture posted on Friday, but since they are pre-recorded it provides more flexibility if the holiday weekend is busier! Also, emailing your TA will probably provide the quickest answer regarding discussions.
by Violet Kwan 3H
Mon Nov 23, 2020 12:06 am
Forum: Student Social/Study Group
Topic: Study Tips for Final Exam
Replies: 57
Views: 454

Re: Study Tips for Final Exam

I definitely think that redoing the textbook problems will probably be the most helpful. Going to UA sessions and practicing old worksheets will also be good because usually, the questions reflect old midterm questions. In addition, I will probably watch some review videos to make sure that the big ...
by Violet Kwan 3H
Mon Nov 23, 2020 12:03 am
Forum: Bond Lengths & Energies
Topic: Higher Melting Point
Replies: 27
Views: 261

Re: Higher Melting Point

It has a higher melting point because the Cl atoms are larger with more energy levels. This means that it is more polarizable and therefore has stronger LDF interactions.
by Violet Kwan 3H
Mon Nov 23, 2020 12:02 am
Forum: Administrative Questions and Class Announcements
Topic: Midterm 2 Scores
Replies: 28
Views: 217

Re: Midterm 2 Scores

It didn't take too long last time. So hopefully, they will come out soon within a week, But it has not been specified
by Violet Kwan 3H
Tue Nov 17, 2020 8:20 pm
Forum: Dipole Moments
Topic: Textbook Question 3F.13
Replies: 1
Views: 24

Textbook Question 3F.13

3F.13 Identify the arrangement (I, II, or III; all molecules are CH2Cl2) that should possess the strongest intermolecular attractions, and justify your selection. Can someone explain why the answer is II instead of III? I might just be confused because I don't the specific orientations that dipoles ...
by Violet Kwan 3H
Sat Nov 14, 2020 5:34 pm
Forum: Octet Exceptions
Topic: Octet Rule Exceptions
Replies: 8
Views: 100

Re: Octet Rule Exceptions

Also, remember that the first 4 atoms also don't follow the octet rule. Hydrogen only needs two electrons to fill a shell. Also, Lithium and Beryllium usually lose electrons to get a full 1s orbital which only contains two electrons.
by Violet Kwan 3H
Sat Nov 14, 2020 3:33 pm
Forum: Student Social/Study Group
Topic: Exercising Our Minds and Bodies
Replies: 120
Views: 616

Re: Exercising Our Minds and Bodies

I've been trying to walk/run on the treadmill more consistently and also go skateboarding :)
by Violet Kwan 3H
Sat Nov 14, 2020 3:31 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 4s
Replies: 4
Views: 18

Re: 4s

Whenever we write out the electron configurations, the 3d will always be written before 4s. Technically, 4s is lower energy than 3d, so it will fill first when we are trying to fill the orbitals in order. However, I believe that once the electrons start filling the 3d shell, the energy levels sort o...
by Violet Kwan 3H
Sat Nov 14, 2020 3:26 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability
Replies: 3
Views: 25

Polarizability

I was wondering if someone can explain the difference in the polarizability of atoms between intermolecular forces vs intramolecular forces. I am just a bit confused because the terms were used in both the "correcting the ionic model" section (which is intramolecular) and the section regar...
by Violet Kwan 3H
Sat Nov 14, 2020 3:22 pm
Forum: Ionic & Covalent Bonds
Topic: Cation vs Anion
Replies: 5
Views: 68

Re: Cation vs Anion

There are some trends in the periodic table. Halogens always form anions and other nonmetals usually form anions as well (lose electrons). Most metals usually form cations (gain electrons). It mainly depends on whether the atom would rather lose or gain electrons in order to form an octet.
by Violet Kwan 3H
Sat Nov 14, 2020 3:12 pm
Forum: Student Social/Study Group
Topic: Midterm 2
Replies: 22
Views: 135

Re: Midterm 2

I will be focusing more on the textbook questions as well. I remember Dr. Lavelle saying that he based a lot of the midterm questions on the textbook. The sapling is helpful for extra practice. :)
by Violet Kwan 3H
Sun Nov 08, 2020 5:26 pm
Forum: Properties of Light
Topic: Study Advice
Replies: 50
Views: 306

Re: Study Advice

If you have time to attend some of the sessions, I would highly recommend it! The UAs are so helpful in explaining steps and ways to understand the problem. They also try to choose the more helpful and specific content for you to practice, and the more practice you get, the better you will be at the...
by Violet Kwan 3H
Sun Nov 08, 2020 5:22 pm
Forum: Formal Charge and Oxidation Numbers
Topic: formal charge
Replies: 11
Views: 43

Re: formal charge

Yes, it does. Formal charge is used to determine the assigned charge of an atom in a molecule specifically.
by Violet Kwan 3H
Sun Nov 08, 2020 5:17 pm
Forum: Electronegativity
Topic: periodic table
Replies: 16
Views: 131

Re: periodic table

Memorizing the trends that all the comments said above will be helpful to answer questions easily, but make sure you also conceptually understand why these trends are happening (such as the number of protons or shells) . When I understand why these trends work, it helps me to remember them more. :)
by Violet Kwan 3H
Sun Nov 08, 2020 5:06 pm
Forum: Administrative Questions and Class Announcements
Topic: Chemistry Community Grading
Replies: 6
Views: 39

Re: Chemistry Community Grading

Also to clarify, both responding to a question and posing a question each counts as one post. But I believe that replying to a post within a question that you originally asked won't count as extra points. It'd be helpful to click on "quick links" and check how many posts you made for the w...
by Violet Kwan 3H
Sun Nov 08, 2020 5:03 pm
Forum: Administrative Questions and Class Announcements
Topic: missing discussion
Replies: 8
Views: 73

Re: missing discussion

There aren't any points counted for it, but you can also ask a classmate in your discussion session for notes or to summarize what the TA covered if they don't answer right away. Also check to see if they upload any PowerPoint slides or notes on CCLE!
by Violet Kwan 3H
Sun Nov 01, 2020 5:32 pm
Forum: Properties of Light
Topic: How to remember what v is in equations
Replies: 46
Views: 276

Re: How to remember what v is in equations

When I am writing equations or using a variable with frequency and velocity, I try to put a mark/tail in front of v for frequency. On the formula sheet, the italicized one is for frequency, and the normal v is for velocity. Also, it would probably be helpful to go over the formula sheet and try to m...
by Violet Kwan 3H
Sat Oct 31, 2020 1:06 pm
Forum: Trends in The Periodic Table
Topic: Trends
Replies: 14
Views: 114

Re: Trends

I agree that in order to really understand the trend, you need to know what is conceptually happening, which a lot of the answers above explained! An easy way for me to remember the trends if you were to just glance at the periodic table is that (starting from the top left corner) going down = large...
by Violet Kwan 3H
Sat Oct 31, 2020 1:01 pm
Forum: SI Units, Unit Conversions
Topic: eV to Joules (Defining these Units) Question
Replies: 12
Views: 111

Re: eV to Joules (Defining these Units) Question

Sometimes questions will give you a number in terms of eV and you need to convert it to J (or vise versa). The relationship is shown on the formula sheet as everyone said. Be sure to check what the question is asking for so you don't miss the answer due to having incorrect units! :)
by Violet Kwan 3H
Sat Oct 31, 2020 12:58 pm
Forum: Properties of Light
Topic: Is c always the speed of light?
Replies: 88
Views: 502

Re: Is c always the speed of light?

Yes it is always the speed of light. It is given to us on the formula sheet as 2.99792 x 10^8, so just use that every time you see the variable or need to use the speed of light in calculations :)
by Violet Kwan 3H
Sat Oct 31, 2020 12:55 pm
Forum: Balancing Chemical Reactions
Topic: Molar Mass
Replies: 23
Views: 204

Re: Molar Mass

For homework or sapling, I usually use two decimal places for molar mass. But on tests, I tried to be a precise as possible (for Oxygen I used 15.9994 instead of 16) and then find sig figs at the very end.
by Violet Kwan 3H
Sun Oct 25, 2020 5:25 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Module #18
Replies: 5
Views: 52

Module #18

18. The hydrogen atom has a radius of approximately 0.05 nm. Assume that we know the position of an electron to an accuracy of 1 % of the hydrogen radius, calculate the uncertainty in the speed of the electron using the Heisenberg uncertainty principle. Comment on your value obtained. A. Delta v <= ...
by Violet Kwan 3H
Sat Oct 24, 2020 2:32 pm
Forum: Student Social/Study Group
Topic: Textbook Information
Replies: 2
Views: 37

Re: Textbook Information

I would also agree with the comment above. If it wasn't mentioned in the lecture, the textbook is probably just providing extra details. Mainly focus on the textbook questions that Dr. Lavelle assigned. Also, have general understanding of the experiments that led to the formulas that we use, because...
by Violet Kwan 3H
Sat Oct 24, 2020 2:28 pm
Forum: Properties of Light
Topic: Application of Equations to Experiments
Replies: 2
Views: 38

Re: Application of Equations to Experiments

I agree with the answer above! The specific ones that Dr. Lavelle showed us tend to reflect simpler scenarios or the original scenarios that gave rise to the equations. In order to apply some of the equations to more complex scenarios, they take some modification, but we dont' have to know how to do...
by Violet Kwan 3H
Sat Oct 24, 2020 2:25 pm
Forum: Student Social/Study Group
Topic: Study tips?
Replies: 9
Views: 94

Re: Study tips?

I definitely feel the same way! But I also think that you are preparing well for the exam if you are able to do all these and understand them. I tried to finish all the textbook questions earlier so that I know what I need to practice, and will probably go over the review ones just because textbook ...
by Violet Kwan 3H
Sat Oct 24, 2020 2:20 pm
Forum: *Shrodinger Equation
Topic: Textbook reading
Replies: 4
Views: 39

Re: Textbook reading

I think 1D.2 refers to the practice problem in the textbook. So of the textbook problems we should be able to do all of section 1A and 1B, and then the first question on 1D, but we won't be tested on any other parts of the section for this midterm. Yes, I was also wondering which textbook questions...
by Violet Kwan 3H
Sat Oct 24, 2020 2:19 pm
Forum: *Shrodinger Equation
Topic: Textbook reading
Replies: 4
Views: 39

Re: Textbook reading

So I am going to assume that you are referencing the Schrodinger equation, since that question is brought up in a lot of lectures and discussions. The only thing we have to know about the Schrodinger equation is that it gives rise to different wave functions that necessitate the need for quantum nu...
by Violet Kwan 3H
Sat Oct 24, 2020 1:44 pm
Forum: SI Units, Unit Conversions
Topic: Midterm
Replies: 26
Views: 230

Re: Midterm

I have heard from the UAs that there will be a mix of both exercise questions and conceptual questions, so it's important to understand the concepts along with the formulas. Also, some of the questions will be longer with more points, and some will be a bit easier to solve in order to buffer the poi...

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